chore(pkg/driverbuilder): log warn if no download script was generated #39

Job	Run time
build-test-master (amd64) / build-test	13m 11s
build-test-master (arm64) / build-test	11m 18s
push-images-master (amd64) / build-images	8m 49s
push-images-master (arm64) / build-images	6m 34s
images-master / push-manifest	10s
	40m 2s

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